D500 INTERFACE SPEC
BBA
A.Nylund
Original Date: 16.3.2004
Nokia D500 DSLAM
Public Interface Specification
Interface Specification
For the D500 R. 3.2.x, R2.4 onwards
Updated: May 19, 2005
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Original Date: 16.3.2004
Contents
1.
PREFACE ...........................................................................................................................................................4
1.1
REFERENCED DOCUMENTS ...........................................................................................................................4
2.
OVERVIEW .......................................................................................................................................................5
3.
DSL INTERFACE CHARACTERISTICS ......................................................................................................6
3.1
3.2
3.3
3.4
4.
ADSL ABOVE POTS: G.992.1 ANNEX A ......................................................................................................9
4.1
4.2
4.3
4.4
5.
GENERAL ....................................................................................................................................................12
TRANSPORT CAPACITY ...............................................................................................................................12
FRAMING MODES ........................................................................................................................................12
NETWORK TIMING REFERENCE ..................................................................................................................12
ADSL ABOVE ISDN: TS 101 388...................................................................................................................12
8.1
8.2
8.3
8.4
9.
GENERAL ....................................................................................................................................................11
TRANSPORT CAPACITY ...............................................................................................................................11
FRAMING MODES ........................................................................................................................................11
NETWORK TIMING REFERENCE ..................................................................................................................11
ADSL ABOVE ISDN: G.992.1 ANNEX B......................................................................................................11
7.1
7.2
7.3
7.4
8.
GENERAL ....................................................................................................................................................10
TRANSPORT CAPACITY ...............................................................................................................................10
NETWORK TIMING REFERENCE ..................................................................................................................11
ADSL ABOVE POTS: T1.413.........................................................................................................................11
6.1
6.2
6.3
6.4
7.
GENERAL ....................................................................................................................................................10
TRANSPORT CAPACITY ...............................................................................................................................10
FRAMING MODES ........................................................................................................................................10
NETWORK TIMING REFERENCE ..................................................................................................................10
ADSL ABOVE POTS: G.992.2 ANNEX A/B.................................................................................................10
5.1
5.2
5.3
6.
ADSL FREQUENCY SPECTRUM USAGE .........................................................................................................6
VDSL FREQUENCY SPECTRUM USAGE .........................................................................................................8
SHDSL FREQUENCY SPECTRUM USAGE .......................................................................................................8
DSL INTERFACES AVAILABLE AT D500 .......................................................................................................9
GENERAL ....................................................................................................................................................12
TRANSPORT CAPACITY ...............................................................................................................................12
FRAMING MODES ........................................................................................................................................13
NETWORK TIMING REFERENCE ..................................................................................................................13
ADSL2 ABOVE POTS: G.992.3 ANNEX A ..................................................................................................13
9.1
9.2
9.3
9.4
9.5
GENERAL ....................................................................................................................................................13
TRANSPORT CAPACITY ...............................................................................................................................13
FRAMING MODES ........................................................................................................................................13
NETWORK TIMING REFERENCE ..................................................................................................................13
DATA ON PILOT SUBCARRIER 64.................................................................................................................14
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10.
10.1
10.2
10.3
10.4
11.
11.1
11.2
11.3
11.4
11.5
12.
12.1
12.2
12.3
12.4
13.
13.1
13.2
13.3
13.4
14.
14.1
14.2
14.3
15.
15.1
15.2
15.3
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ADSL2 ABOVE ISDN: G.992.3 ANNEX B................................................................................................14
GENERAL ....................................................................................................................................................14
TRANSPORT CAPACITY ...............................................................................................................................14
FRAMING MODES ........................................................................................................................................14
NETWORK TIMING REFERENCE ..................................................................................................................14
ADSL2+ ABOVE POTS: G.992.5 ANNEX A ............................................................................................14
GENERAL ....................................................................................................................................................15
TRANSPORT CAPACITY ...............................................................................................................................15
FRAMING MODES ........................................................................................................................................15
NETWORK TIMING REFERENCE ..................................................................................................................15
DATA ON PILOT SUBCARRIER 64.................................................................................................................15
ADSL2+ ABOVE ISDN: G.992.5 ANNEX B .............................................................................................15
GENERAL ....................................................................................................................................................15
TRANSPORT CAPACITY ...............................................................................................................................16
FRAMING MODES ........................................................................................................................................16
NETWORK TIMING REFERENCE ..................................................................................................................16
VDSL ABOVE POTS OR ISDN: G.993.1..................................................................................................16
GENERAL ....................................................................................................................................................16
TRANSPORT CAPACITY ...............................................................................................................................16
FRAMING MODES ........................................................................................................................................17
PILOT TONE .................................................................................................................................................17
SHDSL: G.991.2 ANNEX A.........................................................................................................................17
GENERAL ....................................................................................................................................................17
TRANSPORT CAPACITY ...............................................................................................................................17
NETWORK TIMING REFERENCE ..................................................................................................................17
SHDSL: G.991.2 ANNEX B.........................................................................................................................17
GENERAL ....................................................................................................................................................17
TRANSPORT CAPACITY ...............................................................................................................................17
NETWORK TIMING REFERENCE ..................................................................................................................18
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1. PREFACE
The Nokia D500 DSLAM is an access system for ATM based and Ethernet based networks.
This document specifies the DSL physical layer interface based on:
• ANSI Standard T1.413 [1];
• ETSI Technical Specification TS 101 388 [2];
• ITU-T Recommendation G.992.1 [3];
• ITU-T Recommendation G.992.2 [4];
• ITU-T Recommendation G.992.3 [5];
• ITU-T Recommendation G.992.5 [7];
• ITU-T Recommendation G.994.1 [8];
• ITU-T Recommendation G.991.2 [6];
• ETSI Technical Specification TS 101 524 [10].
• ITU-T Recommendation G.993.1 [11];
Also annexes are added, describing:
• Annex A: ATM layer interface specification;
• Annex B: IP layer interface specification;
• Annex C: VoDSL interface specification.
This document provides the specification of the digital subscriber line interface. It refers to publicly available
standards wherever possible. The XTU–C transmitter characteristics are described as they apply to the D500 central
office and D500 remote access multiplexer (or RAM) equipment.
The xTU–R transmitter requirements are specified with respect to interoperability with the D500 xTU–C. xTU–R
requirements that may affect interoperability of the D500l xTU–C are highlighted in this document.
1.1 Referenced Documents
The following documents are referenced:
[1] ANSI Standard T1.413-1998, “Network and Customer Installation Interfaces – Asymmetrical Digital
Subscriber Line (ADSL) Metallic Interface”, publication by the ANSI.
[2] ETSI Technical Specification TS 101 388, “Access transmission systems on metallic access cables; Asymetric
Digital Subscriber Line (ADSL) - Coexistence of ADSL and ISDN-BA on the same pair [ANSI T1.413-1998,
modified]”, November 1998.
[3] ITU-T Recommendation G.992.1, “Asymmetrical Digital Subscriber Line (ADSL) Transceivers”, publication
by the ITU-T, 1999.
[4] ITU-T Recommendation G.992.2, “Splitterless Asymmetrical Digital Subscriber Line (ADSL) Transceivers”,
publication by the ITU-T, 1999.
[5] ITU-T Recommendation G.992.3, “Asymmetric digital subscriber line transceivers - 2 (ADSL2)”
[6] ITU-T Recommendation G.991.2, “Single-Pair High Speed Digital Subscriber Line (SHDSL) Transceivers“,
publication by the ITU-T, 2001.
[7] ITU-T Recommendation G.992.5, “Asymmetrical Digital Subscriber Line (ADSL) transceivers - Extended
bandwidth ADSL2 (ADSL2+)”
[8] ITU-T Recommendation G.994.1, “Handshake Procedures for Asymmetrical Digital Subscriber Line (ADSL)
Transceivers”, publication by the ITU-T 05/2003.
[10] ETSI Technical Specification TS 101 524, “Symmetric single pair high bit rate digital subscriber line (SDSL)
transmission system on metallic local lines”, version 1.1.2, August 2001.
[11] ITU-T Recommendation G.993.1, “Very high speed digital subscriber line foundation”
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2. OVERVIEW
The D500 implements transport methods for delivery of broadband services on ordinary subscriber loops. It uses
the latest techniques to allow high–speed digital communications between the D500 and a DSL modem at the
customer’s premises (residential, SOHO or business). Both asymmetric (ADSL) and symmetric (SHDSL)
interfaces are available.
Figure 1 and Figure 2 show the general ADSL architectures and their interfaces (depending on the usage of a
SPLITTER or micro filter at subscriber premises). The following main building blocks can be distinguished:
• D500 with ADSL interface and splitters at the network side.
• ADSL Customer Premises Equipment (CPE) at the subscriber side with splitter or microfilters.
In the case of Figure 1, a POTS or ISDN splitter is located at the entrance of the customer premises. A splitter is
used for operation of ADSL above POTS and a ISDN splitter (universal splitter) is used for operation of ADSL
above ISDN or POTS.
ATM or
Ethernet
IP core
PSTN
DSLAM CO splitters
ADSL or VDSL
POTS or ISDN
CPE
Data,
Voice,
video
Home
splitter
Figure 1 ADSL access with ISDN or POTS splitters at CO and CPE side
ATM or
Ethernet
IP core
PSTN
DSLAM CO splitters
ADSL or VDSL
POTS or ISDN
CPE
Data,
Voice,
video
micro
filter
Figure 2 ADSL access with ISDN or POTS micro filters at CO side and splitters at subscriber side
In the case of Figure 2, no SPLITTER is used at the entrance of the subscriber premises. Micro filters
(Low Pass Filters (LPF)) are used to protect phone sets (or other voice band appliances) from interfering
with the ADSL signal. Depending on the phone set characteristics, the absence of such LPF may have a
severe impact on ADSL performance and/or the voice connection may be severely disturbed by the
ADSL signal.
The Figure 3 shows the general SHDSL architectures and interfaces. The following main building blocks
can be distinguished:
• D500 with SHDSL interface at the network side.
• SHDSL Customer Premises Equipment (CPE) at the subscriber side.
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DSLAM
ATM or
Ethernet
IP core
SHDSL
CPE
Data,
Voice,
video
Figure 3 SHDSL access, mainly used business customers and G2, G3 base station access
The connection mey run in two wire mode or in four-wire (two-pair) mode to increase BW or reach or
both. In the case of Figure 3, the SHDSL CPE may provide data, voice and/or video conferencing
services. Alternatively, more business oriented interfaces may be provided, e.g., PABX interconnect, FR
interworking.
3. DSL INTERFACE CHARACTERISTICS
3.1 ADSL frequency spectrum usage
POTS
US
Annex A
DS
0
138 kHz
POTS
US
Annex B*
0
120 kHz
ISDN
0
120 kHz
2208 kHz f
1104 kHz
2208 kHz f
1104 kHz
2208 kHz f
DS
276 kHz
US
Annex B
1104 kHz
DS
276 kHz
Figure 4 ADSL over POTS and over ISDN line spectrum. Annex B* means ADSL in ISDN mode over POTS
The Digital Subscriber Line (DSL) interface carries the normal Plain Old Telephone Service (POTS) frequencies
multiplexed with the upstream and downstream ADSL signals. The interface connects the ATU–R (in the CPE) to
the ATU-C in D500 via the standard subscriber cooper loop.
The upstream and downstream signals are DMT modulated. A view of spectrum usage with different modes of
DMT ADSL is shown in Figures 4 to 6. It is not recommended to use different ADSL modes, where up- and downstream spectra of the different modes overlap each other, withing the same subscriber cable.
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US
Annex
DS
0
138 kHz
POTS
US
Annex
0
120 kHz
ISDN
0
276 kHz
120 kHz
0
f
1104 kHz
2208 kHz
f
1104 kHz
2208 kHz
f
1104 kHz
2208 kHz
f
1104 kHz
2208 kHz
f
2208 kHz
f
DS
276 kHz
US
Annex
2208 kHz
DS
US
Annex
1104 kHz
DS
138 kHz
POTS
US
Annex
DS
0
POTS
276 kHz
US
Annex
0
DS
60 or
138 kHz
103 kHz
552 kHz
* = In the process of being standardized
Figure 5 ADSL2 over POTS and ISDN line spectrum. Annexes I and J not yet supported
POTS
Annex A
US
0
DS
2208 kHz f
138 kHz
ISDN
US
Annex B
0
120 kHz
DS
US
Annex I
0
DS
2208 kHz f
138 kHz
US
Annex J*
0
POTS
DS
0
2208 kHz f
276 kHz
US
Annex L*
2208 kHz f
276 kHz
DS
276 kHz
2208 kHz f
* = In the process of being standardized
Figure 6 ADSL2+ line spectrum in ISDN and POTS modes . Annexes I and J not yet supported.
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3.2 VDSL frequency spectrum usage
Band plan A (formerly called 998)
opt
DS1
US1
0.025 0.138
3.75
DS2
5.2
US2
8.5
f(MHz)
12
Band plan B (formerly called 997)
opt
0.025 0.138
DS1
US1
3.0
DS2
5.1
US2
7.05
f(MHz)
12
Figure 7 VDSL. Frequency plans A (998) and B (997)
The optionl band is not supported and the Digital Subscriber Line (DSL) interface can carry the normal Plain Old
Telephone Service (POTS) frequencies or ISDN frequencies multiplexed with the upstream and downstream VDSL
signals. The interface connects the ATU–R (in the CPE) to the ATU-C in D500 via the standard subscriber cooper
loop.
The upstream and downstream signals are DMT modulated. A view of spectrum usage with different frequency
plans of DMT VDSL is shown in Figures 7. The current unit supports 2 or 3 band operation with band plans A and
B. It is not recommended to use different VDSL frequency plans withing the same subscriber cable, because
crosstalk between overlapping up- and downstream bands will deteriorate connection performance.
3.3 SHDSL frequency spectrum usage
The Digital Subscriber Line (DSL) interface carries the upstream and downstream SHDSL signals. The
downstream and upstream signals use the same frequency band. The frequency bandwidth depends on the data rate
provided. Typically, the (3 dB down) bandwidth is the data rate devided by 6 (e.g., 384 kHz at 2.304 Mbit/s). The
interface connects the STU–R (in the CPE) to the STU-C (in the DSLAM) via the copper access network. Normal
subscriber line wire is used for the connection.
The upstream and downstream signals are 16-TCPAM modulated. A view of the PAM power spectrum density
(PSD) used in the SHDSL modem is shown in Figure 6. It shows how the bandwidth used by the SHDSL signal
scales with the data rate.
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3.4 DSL Interfaces available at D500
Nokia D500 supports the following ADSL line cards:
• ADSL above POTS per ITU-T Rec. G.992.1 Annex A [3];
• ADSL above POTS per ITU-T Rec. G.992.2 Annex A/B [4];
• ADSL in TCM noise enviroment per ITU-T Rec. G.992.2 Annex C [4].
• ADSL above POTS per ANSI Standard T1.413 [1];
• ADSL above ISDN per ITU-T Rec. G.992.1 Annex B [3];
• ADSL above ISDN per ETSI Technical Spec. TS 101 388 [2].
• ADSL2 above POTS per ITU-T Rec. G.992.3 Annex A [5]
• ADSL2 above ISDN per ITU-T Rec. G.992.3 Annex B [5]
• ADSL2+ above POTS per ITU-T Rec. G.992.5 Annex A [7]
• ADSL2+ above ISDN per ITU-T Rec. G.992.5 Annex B [7]
Nokia D500 supports the following SHDSL operating modes:
• SHDSL for North America per ITU-T Rec. G.991.2 Annex A [6].
• SHDSL for Europe per ITU-T Rec. G.991.2 Annex B [6].
• SHDSL ITU-T Rec. G.991.2, E9.2 four wire mode [6].
Nokia D500 supports the following VDSL line card
• VDSL above POTS or ISDN: G.993.1
The ATU-C characteristics and the ATU-R requirements to interoperate with the ATU-C are described in separate
sections for each of these operating modes.
4. ADSL ABOVE POTS: G.992.1 ANNEX A
The ITU-T Recommendation G.992.1 is also known as G.dmt.
The ATU-C startup procedure supports both the G.994.1 Handshake Procedures [5] and the T1.413-1998
Initialization Procedure [1].
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In case the ATU-R alternates [5] and [1] according to G.994.1 Annex A, the ATU-C gives priority to G.994.1
Handshake Procedures and a subsequent G.992.x operating mode.
In case both the ATU-C and the ATU-R support the G.992.1 and G.992.2 operating modes, the ATU-C (when
selecting the operating mode) gives priority to the G.992.1 operating mode.
4.1 General
The U-C interface is compliant with G.992.1 Annex A [3] (including G.994.1 [5]), unless explicitly stated in this
section.
The U-R interface shall be compliant with G.992.1 Annex A [3] (including G.994.1 [5]).
The U–C interface is an ATM cell–based interface. The ATU–C is configured for ATM transport and complies
with sections 5.1.2, 6.2, and 7.2 of G.992.1 [3].
The U–R interface shall be an ATM cell–based interface. The ATU–R shall be configured for ATM transport and
shall comply with sections 5.2.2, 6.2, and 8.2 of G.992.1 [3].
4.2 Transport capacity
The transport capacity of the ATU–C complies with section 6.2 of G.992.1 [3]. It supports downstream
transmission at all multiples of 32 kb/s up to a net data rate of 8128 kb/s, and upstream reception at all multiples of
32 kb/s up to a net data rate of 1024kb/s upstream.
The maximum downstream transport capacity of the ATU–C implementation is 10816 kb/s (total data rate). The
actual downstream transport capacity depends upon the line characteristics measured at modem initialization and
the implementation limitations of the ATU-R. The ADSL system overhead depends on the modem configuration
and can be as low as 32 kb/s.
4.3 Framing Modes
ATU-C supports interleaved and fast path modes (framing modes 1 and 3). Dual latency mode is not supported.
4.4 Network Timing Reference
The NTR bit in C-MSG1 is always coded “0”. The downstream indicator bits 23–20 are always coded “1111”.
5. ADSL ABOVE POTS: G.992.2 ANNEX A/B
The ITU-T Recommendation G.992.2 is also known as G.lite.
The ATU-C startup procedure supports both the G.994.1 Handshake Procedures [5] and the T1.413-1998
Initialization Procedure [1].
In case the ATU-R alternates [5] and [1] according to G.994.1 Annex A, the ATU-C gives priority to G.994.1
Handshake Procedures and a subsequent G.992.x operating mode.
In case both the ATU-C and the ATU-R support the G.992.1 and G.992.2 operating modes, the ATU-C (when
selecting the operating mode) gives priority to the G.992.1 operating mode.
5.1 General
The U-C interface is compliant with G.992.2 Annex A/B [4] (including G.994.1 [5]).
The U-R interface shall be compliant with G.992.2 Annex A/B [4] (including G.994.1 [5]).
5.2 Transport capacity
The transport capacity of the ATU–C complies with section 5 of G.992.2 [4]. It supports downstream transmission
at all multiples of 32 kb/s up to a net data rate of 1.536 Mb/s, and upstream reception at all multiples of 32 kb/s up
to a net data rate of 512 kb/s upstream.
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5.3 Network Timing Reference
The NTR bit in C-MSG1 is always coded “0”. The downstream indicator bits 23–20 are always coded “1111”.
6. ADSL ABOVE POTS: T1.413
The ANSI Standard T1.413-1998 is also known as T1.413 Issue 2.
The ATU-C startup procedure supports both the G.994.1 Handshake Procedures [5] and the T1.413-1998
Initialization Procedure [1].
In case the ATU-R alternates [5] and [1] according to G.994.1 Annex A, the ATU-C gives priority to G.994.1
Handshake Procedures and a subsequent G.992.x operating mode.
In case both the ATU-C and the ATU-R support the G.992.1 and G.992.2 operating modes, the ATU-C (when
selecting the operating mode) gives priority to the G.992.1 operating mode.
6.1 General
The U-C interface is compliant with T1.413 [1], unless explicitly stated in this section.
The U-R interface shall be compliant with T1.413 [1].
The U–C interface is an ATM cell–based interface. The ATU–C is configured for ATM transport and complies
with sections 4.2.2, 5.2, and 6.2 of T1.413 [1].
The U–R interface shall be an ATM cell–based interface. The ATU–R shall be configured for ATM transport and
shall comply with sections 4.3.2, 5.2, and 7.2 of T1.413 [1].
6.2 Transport capacity
The transport capacity of the ATU–C complies with section 5.2 of T1.413 [1]. It supports downstream transmission
at all multiples of 32 kb/s up to a net data rate of 8128 kb/s, and upstream reception at all multiples of 32 kb/s up to
a net data rate of 1024 kb/s upstream.
The maximum downstream transport capacity of the ATU–C implementation is 10816 kb/s (total data rate). The
actual downstream transport capacity depends upon the line characteristics measured at modem initialization and
the implementation limitations of the ATU-R. The ADSL system overhead depends on the modem configuration
and can be as low as 32 kb/s.
6.3 Framing Modes
ATU-C supports interleaved and fast path modes (framing modes 1 and 3). Dual latency mode is not supported.
6.4 Network Timing Reference
The NTR bit in C-MSG1 is always coded “0”. The downstream indicator bits 23–20 are always coded “1111”.
7. ADSL ABOVE ISDN: G.992.1 ANNEX B
The ITU-T Recommendation G.992.1 is also known as G.dmt.
The ATU-C startup procedure supports both the G.994.1 Handshake Procedures [5] and the TS 101 388
Initialization Procedure [2].
In case the ATU-R alternates [5] and [2] according to G.994.1 Annex A, the ATU-C gives priority to G.994.1
Handshake Procedures and a subsequent G.992.x operating mode.
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7.1 General
The U-C interface is compliant with G.992.1 Annex B [3] (including G.994.1 [5]), unless explicitly stated in this
section.
The U-R interface shall be compliant with G.992.1 Annex B [3] (including G.994.1 [5]).
The U–C interface is an ATM cell–based interface. The ATU–C is configured for ATM transport and complies
with sections 5.1.2, 6.2, and 7.2 of G.992.1 [3].
The U–R interface shall be an ATM cell–based interface. The ATU–R shall be configured for ATM transport and
shall comply with sections 5.2.2, 6.2, and 8.2 of G.992.1 [3].
7.2 Transport capacity
The transport capacity of the ATU–C complies with section 6.2 of G.992.1 [3]. It supports downstream
transmission at all multiples of 32 kb/s up to a net data rate of 8128 kb/s, and upstream reception at all multiples of
32 kb/s up to a net data rate of 1024 kb/s upstream.
.
The maximum downstream transport capacity of the ATU–C implementation is 10816 kb/s (total data rate). The
actual downstream transport capacity depends upon the line characteristics measured at modem initialization and
the implementation limitations of the ATU-R. The ADSL system overhead depends on the modem configuration
and can be as low as 32 kb/s.
7.3 Framing Modes
ATU-C supports interleaved and fast path modes (framing modes 1 and 3). Dual latency mode is not supported.
7.4 Network Timing Reference
The NTR bit in C-MSG1 is always coded “0”. The downstream indicator bits 23–20 are always coded “1111”.
8. ADSL ABOVE ISDN: TS 101 388
The TS 101 388 Technical Specification is an adaptation of the ANSI ADSL over POTS Standard T1.413-1998 [1]
for the transport of ADSL over ISDN.
The ATU-C startup procedure supports both the G.994.1 Handshake Procedures [5] and the T1.413-1998
Initialization Procedure [1].
In case the ATU-R alternates [5] and [1] according to G.994.1 Annex A, the ATU-C gives priority to G.994.1
Handshake Procedures and a subsequent G.992.x operating mode.
8.1 General
The U-C interface is compliant with TS 101 388 [2], unless explicitly stated in this section.
The U-R interface shall be compliant with TS 101 388 [2].
The U–C interface is an ATM cell–based interface. The ATU–C is configured for ATM transport and complies
with TS 101 388 [2], which references sections 4.2.2, 5.2, and 6.2 of T1.413 [1].
The U–R interface shall be an ATM cell–based interface. The ATU–R shall be configured for ATM transport and
shall comply with TS 101 388 [2], which references sections 4.3.2, 5.2, and 7.2 of T1.413 [1].
8.2 Transport capacity
The transport capacity of the ATU–C complies with TS 101 388 [2], which references section 5.2 of T1.413 [1]. It
supports downstream transmission at all multiples of 32 kb/s up to a net data rate of 8128 kb/s, and upstream
reception at all multiples of 32 kb/s up to a net data rate of 1024 kb/s upstream.
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The maximum downstream transport capacity of the ATU–C implementation is 10816 kb/s (total data rate). The
actual downstream transport capacity depends upon the line characteristics measured at modem initialization and
the implementation limitations of the ATU-R. The ADSL system overhead depends on the modem configuration
and can be as low as 32 kb/s.
8.3 Framing Modes
ATU-C supports interleaved and fast path modes (framing modes 1 and 3). Dual latency mode is not supported.
8.4 Network Timing Reference
The NTR bit in C-MSG1 is always coded “0”. The downstream indicator bits 23–20 are always coded “1111”.
9. ADSL2 ABOVE POTS: G.992.3 ANNEX A
The ITU-T Recommendation G.992.3 is also known as ADSL2
The ATU-C startup procedure supports both the G.994.1 Handshake Procedures [8] and the T1.413-1998
Initialization Procedure [1].
In case the ATU-R alternates [8] and [1] according to G.994.1 Annex A, the ATU-C gives priority to G.994.1
Handshake Procedures and a subsequent G.992.x operating mode.
9.1 General
The U-C interface is compliant with G.992.3 Annex A [5] (including G.994.1 [8]), unless explicitly stated in this
section.
The U-R interface shall be compliant with G.992.3 Annex A [5] (including G.994.1 [8]).
The U–C interface is an ATM cell–based interface. The ATU–C is configured for ATM transport and complies
with Annex K.2 of G.992.3 [5].
The U–R interface shall be an ATM cell–based interface. The ATU–R shall be configured for ATM transport and
shall comply with annex K.2 of G.992.3 [5].
9.2 Transport capacity
The transport capacity of the ATU–C complies with section K.2.5 of G.992.3 [5]. It supports downstream
transmission at all multiples of 32 kb/s up to a net data rate of 12 Mb/s, and upstream reception at all multiples of
32 kb/s up to a net data rate of 1024 kb/s upstream.
The maximum downstream transport capacity of the ATU–C implementation is 12Mb/s (total data rate). The actual
downstream transport capacity depends upon the line characteristics measured at modem initialization and the
implementation limitations of the ATU-R. The ADSL system overhead depends on the modem configuration and
can be as low as 32 kb/s.
9.3 Framing Modes
ATU-C supports interleaved and fast path modes.
9.4 Network Timing Reference
The ATU-C inserts the Network Timing Reference in the ADSL frame, as specified in G.992.3 [5]. The ATU-R
may recover the Network Timing Reference from that information.
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9.5 Data on pilot subcarrier 64
The ITU-T Recommendation G.992.3 specifies that no data shall be carried on the downstream pilot subcarrier 64.
However, the ATU-C may indicate in the G.994.1 non-standard information field (NSIF) that it supports
modulation of data on the downstream pilot subcarrier 64. If the ATU-R indicates the same, then data modulation
on the downstream pilot subcarrier 64 is enabled. The G.994.1 NSIF syntax is defined in Annex A.
10. ADSL2 ABOVE ISDN: G.992.3 ANNEX B
The ITU-T Recommendation G.992.3 is also known as ADSL2.
The ATU-C startup procedure supports both the G.994.1 Handshake Procedures [8] and the TS 101 388
Initialization Procedure [2].
In case the ATU-R alternates [8] and [2] according to G.994.1 Annex A, the ATU-C gives priority to G.994.1
Handshake Procedures and a subsequent G.992.x operating mode.
10.1 General
The U-C interface is compliant with G.992.3 Annex B [5] (including G.994.1 [8]), unless explicitly stated in this
section.
The U-R interface shall be compliant with G.992.3 Annex B [5] (including G.994.1 [8]).
The U–C interface is an ATM cell–based interface. The ATU–C is configured for ATM transport and complies
with K.2 of G.992.3 [5].
The U–R interface shall be an ATM cell–based interface. The ATU–R shall be configured for ATM transport and
shall comply with annex K.2 of G.992.3 [5].
10.2 Transport capacity
The transport capacity of the ATU–C complies with section K.2.5 of G.992.3 [5]. It supports downstream
transmission at all multiples of 32 kb/s up to a net data rate of 12 Mb/s, and upstream reception at all multiples of
32 kb/s up to a net data rate of 1024 kb/s upstream.
The maximum downstream transport capacity of the ATU–C implementation is 12Mb/s (total data rate). The actual
downstream transport capacity depends upon the line characteristics measured at modem initialization and the
implementation limitations of the ATU-R. The ADSL system overhead depends on the modem configuration and
can be as low as 32 kb/s.
10.3 Framing Modes
ATU-C supports interleaved and fast framing modes.
10.4 Network Timing Reference
The ATU-C inserts the Network Timing Reference in the ADSL frame, as specified in G.992.3 [5]. The ATU-R
may recover the Network Timing Reference from that information.
11. ADSL2+ ABOVE POTS: G.992.5 ANNEX A
The ITU-T Recommendation G.992.5 is also known as ADSL2+
The ATU-C startup procedure supports both the G.994.1 Handshake Procedures [8] and the T1.413-1998
Initialization Procedure [1].
In case the ATU-R alternates [8] and [1] according to G.994.1 Annex A, the ATU-C gives priority to G.994.1
Handshake Procedures and a subsequent G.992.x operating mode.
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11.1 General
The U-C interface is compliant with G.992.5 Annex A [7] (including G.994.1 [8]), unless explicitly stated in this
section.
The U-R interface shall be compliant with G.992.5 Annex A [7] (including G.994.1 [8]).
The U–C interface is an ATM cell–based interface. The ATU–C is configured for ATM transport and complies
with annex K.2 of G.992.3 [5].
The U–R interface shall be an ATM cell–based interface. The ATU–R shall be configured for ATM transport and
shall comply with annex K.2 of G.992.3 [5].
11.2 Transport capacity
The transport capacity of the ATU–C complies with section K.2.5 of G.992.3 [5]. It supports downstream
transmission at all multiples of 32 kb/s up to a net data rate of 24 Mb/s, and upstream reception at all multiples of
32 kb/s up to a net data rate of 1024 kb/s upstream.
The maximum downstream transport capacity of the ATU–C implementation is 24 Mb/s (total data rate). The
actual downstream transport capacity depends upon the line characteristics measured at modem initialization and
the implementation limitations of the ATU-R. The ADSL system overhead depends on the modem configuration
and can be as low as 32 kb/s.
11.3 Framing Modes
ATU-C supports interleaved and fast framing modes.
11.4 Network Timing Reference
The ATU-C inserts the Network Timing Reference in the ADSL frame, as specified in G.992.5 [7]. The ATU-R
may recover the Network Timing Reference from that information.
11.5 Data on pilot subcarrier 64
The ITU-T Recommendation G.992.5 specifies that no data shall be carried on the downstream pilot subcarrier 64.
However, the ATU-C may indicate in the G.994.1 non-standard information field (NSIF) that it supports
modulation of data on the downstream pilot subcarrier 64. If the ATU-R indicates the same, then data modulation
on the downstream pilot subcarrier 64 is enabled. The G.994.1 NSIF syntax is defined in Annex A.
12. ADSL2+ ABOVE ISDN: G.992.5 ANNEX B
The ITU-T Recommendation G.992.5 is also known as ADSL2+
The ATU-C startup procedure supports both the G.994.1 Handshake Procedures [8] and the T1.413-1998
Initialization Procedure [1].
In case the ATU-R alternates [8] and [1] according to G.994.1 Annex B, the ATU-C gives priority to G.994.1
Handshake Procedures and a subsequent G.992.x operating mode.
12.1 General
The U-C interface is compliant with G.992.5 Annex B [7] (including G.994.1 [8]), unless explicitly stated in this
section.
The U-R interface shall be compliant with G.992.5 Annex B [7] (including G.994.1 [8]).
The U–C interface is an ATM cell–based interface. The ATU–C is configured for ATM transport and complies
with annex K.2 of G.992.3.
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The U–R interface shall be an ATM cell–based interface. The ATU–R shall be configured for ATM transport and
shall comply with annex K.2 of G.992.3 [5].
12.2 Transport capacity
The transport capacity of the ATU–C complies with section K.2.5 of G.992.3]. It supports downstream
transmission at all multiples of 32 kb/s up to a net data rate of 24 Mb/s, and upstream reception at all multiples of
32 kb/s up to a net data rate of 1024 kb/s upstream.
The maximum downstream transport capacity of the ATU–C implementation is 24 Mb/s (total data rate). The
actual downstream transport capacity depends upon the line characteristics measured at modem initialization and
the implementation limitations of the ATU-R. The ADSL system overhead depends on the modem configuration
and can be as low as 32 kb/s.
12.3 Framing Modes
ATU-C supports interleaved and fast framing modes.
12.4 Network Timing Reference
The ATU-C inserts the Network Timing Reference in the ADSL frame, as specified in G.992.5 [7]. The ATU-R
may recover the Network Timing Reference from that information.
13. VDSL ABOVE POTS OR ISDN: G.993.1
The ITU-T Recommendation G.993.1 is also known as VDSL fundation document.
The ATU-C startup procedure supports both the G.994.1 Handshake Procedures [8]
13.1 General
The U-C interface is compliant with G.993.1 Annex A [7] (including G.994.1 [8]), unless explicitly stated in this
section.
The U-R interface shall be compliant with G.993.1 Annex A [7] (including G.994.1 [8]).
The U–C interface is an ATM cell–based interface.
Both the asymmetric frequency plan A (previously known as 998) and symmetric frequency plan B (previously
known as 997) are supported.
13.2 Transport capacity
The minimum and maximum transport capacities of ATU–C and ATU-R are listed in the table below. The bit rate
can be incremented from min to max value in steps of 64 kb/s.
Band plan
Upstream direction
Downstream direction
min
max
min
max
B (997)
2 band
64
10048
64
10048
B (997)
3 band
64
25024
64
25024
A (998)
2 band
64
3008
64
22016
A (998)
3 band
64
10048
64
45056
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13.3 Framing Modes
ATU-C supports interleaved and fast framing modes.
13.4 Pilot tone
Use of dedicated pilot tone is optional. If the VTU-R requires a dedicated pilot tone it indicates its choice of pilot
tone to the VTU-C during initialization.
14. SHDSL: G.991.2 ANNEX A
14.1 General
The U-C interface is compliant with G.991.2 Annex A [6], unless explicitly stated in this section. The G.991.2
Annex A operating mode is activated through the G.994.1 Handshake Procedure [5].
The U-R interface shall be compliant with G.991.2 Annex A [6].
The U–C interface is an ATM cell–based interface. The STU–C is configured for ATM transport and complies with
section E.9 of G.991.2 [6].
The U–R interface shall be an ATM cell–based interface. The STU–R shall be configured for ATM transport and
shall comply with section E.9 of G.991.2 [6].
14.2 Transport capacity
The transport capacity of the STU–C complies with section 5 of G.991.2 [6]. It supports symmetric data rates at all
multiples of 64 kbit/s, from 192 kbit/s up to a net data rate of 2.304 Mbit/s. In four-wire mode, data rates at
multiples of 128 kb/s from 384 kbit/s to 4.608 Mbit/s are supported. The data rate may be fixed or limited to within
a range of data rates through the Central Office MIB.
14.3 Network Timing Reference
NTR will be supported.
15. SHDSL: G.991.2 ANNEX B
Operation according to G.992.1 Annex B [6] is identical to operation according to ETSI SDSL TS 101 524 [7].
Both operating modes are activated in exactly the same way through G.994.1 Handshake Procedures [5]. Therefore,
the STU-R cannot distinguish the two operating modes. The STU-R interface requirements are identical for both
operating modes and desceibed from G.992.1 Annex B perspective below.
15.1 General
The U-C interface is compliant with G.991.2 Annex B [6], unless explicitly stated in this section. The G.991.2
Annex B operating mode is activated through the G.994.1 Handshake Procedure [5].
The U-R interface shall be compliant with G.991.2 Annex B [6].
The U–C interface is an ATM cell–based interface. The STU–C is configured for ATM transport and complies with
section E.9 of G.991.2 [6].
The U–R interface shall be an ATM cell–based interface. The STU–R shall be configured for ATM transport and
shall comply with section E.9 of G.991.2 [6].
15.2 Transport capacity
The transport capacity of the STU–C complies with section 5 of G.991.2 [6]. It supports symmetric data rates at all
multiples of 64 kbit/s, from 192 kbit/s up to a net data rate of 2.304 Mbit/s. In four-wore mode, data rates at
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multiples of 128 kb/s from 384 kbit/s to 4.608 Mbit/s are supported. The data rate may be fixed or limited to within
a range of data rates through the Central Office MIB.
The STU-C is also planned to support the symmetric data rate of 2.312 Mbit/s for transport of the 2048 kbit/s E1
service over AAL1 ATM. When configured in this mode, the STU-C advertises a single data rate in the G.994.1
handshake [5], indicating ATM mode with n=36 and i=1. This mode is not supported in four-wire operation.
The transport capacity of the STU–R shall comply with section 5 of G.991.2 [6]. It shall support one or
more symmetric data rates at multiples of 64 kbit/s, from 192 kbit/s up to a net data rate of 2.312 Mbit/s.
15.3 Network Timing Reference
NTR is not supported.
Annex A: G.994.1 non-standard facilities
A.1 Vendor information
The ATU-C uses the following parameters in G.994.1:
COUNTRY CODE USA “181”
VENDOR CODE Texas Instruments “TSTC”
The vendor specific information is coded according to the NPAR/SPAR tree structure as defined in G.994.1 [4] for
the Standard Information Field, with codepoints defined below.
A.2 Non-standard facilities
A.2.1 Data on pilot subcarrier 64
If the DPM codepoint is set in the CL message, the ATU-C supports modulation of data on the downstream pilot
subcarrier 64 (transmitter function). Otherwise, the ATU-C does not.
The ATU-R may set the DPM codepoint in the CLR message to indicate it supports modulation of data on the
downstream pilot subcarrier 64 (receiver function).
The DPM codepoint shall be set in the MS message if and only if it is set in both the CL and CLR message. If the
DPM codepoint is set in the MS message, the ATU-R may request a bi>0 for downstream subcarrier 64 (during
initialization or through bit swap). In that case, the ATU-C transmits subcarrier 64 as a data subcarrier.
Annex B: ATM Layer Interoperability
This annex is published to provide a technical description of the ATM layer of the user network interface. It is
intended as a guideline for third–party ATM systems to successfully interoperate with D500.
For describing the ATM interoperability, the ATM reference model is used to specify the various aspects. It is
assumed the reader is familiar with this model and its terminology.
All features are supported in both upstream and downstream directions unless otherwise stated.
B.1 Referenced Documents
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[ITU–T-I.361] ITU-T Recommendation I.361 ISDN Overall Network Aspects and Functions (11/95). B–ISDN
ATM Layer Specification.
[ITU–T-I.371] ITU-T Recommendation I.371 ISDN Traffic Control and Congestion Control (08/96). B–ISDN
ATM Layer Specification.
[ITU–T–I.432] ITU-T Recommendation I.432.1 - B–ISDN User-Network Interface - Physical Layer Specification:
General Characteristics, August 1996.
[ITU–T–I.610] ITU-T Recommendation I.610 - B–ISDN Operation and Maintenance Principles and Functions
(11/95).
[ATMF-3.1] ATM Forum AF–UNI–0010.002 - ATM User-Network Interface Specification V3.1.
[ATMF-Traffic] ATM Forum AF–TM–0056.000 - Traffic Management Specification Version 4.0.
The base documents for ATM layer specifications are [ITU–T-I.731], [ITU–T-I.732], [ITU-T-I.361] and [ATMF3.1].
B.2 PMD & TC Layers
The functions listed below are typically Physical Medium Dependent and Transmission Convergence Sublayer
functions:
• Cell Stream mapping/demapping
• Cell Delineation
• Payload Scrambling
• HEC Processing
• Cell Rate Decoupling
These functions interact directly with the underlying ADSL layer, which is almost independent of the processing of
ATM cells. Therefore, this specific interoperability information is described in the documents referenced in the
ADSL interface description.
B.3 ATM Cell Header Format
Cell Format
The ATM cell format is compliant with Recommendation [ITU-T-I.361].
This implies the cell structure complies with the generic ATM cell structure as defined in [ITU-T-I.361] Clause
2.1: Cell Structure.
The cell header coding scheme is of type ITU public UNI and complies to [ITU-T-I.361] Clause 2.2: Cell header
format and encoding at UNI.
GFC Field
The GFC field coding is compliant with [ITU-T-I.361] Clause 2.2.2: Generic Flow Control field. Currently it is
assumed that most CPE equipment connected to the D500 acts as "uncontrolled equipment". According to [ITU-TI.361] this implies:
• downstream: cells sourced by the D500 will have their GFC bits set to 0;
• no action shall be taken by D500 on GFC field settings of received cells, moreover, non-zero GFC bits shall be
forced to zero for cells "in transit".
Routing field (VPI & VCI field)
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The 24 bit routing field consists of 8 bits VPI and 16 bits VCI, which is compliant with [ITU-T-I.361] UNI format.
29 / 34
For PVC's VPI values can range from 0 to 255 and VCI values from 32 to 65535. The actual number of bits in the
VPI and VCI fields used for routing, are configured compliant with the rules defined in [ITU-T-I.361] Clause 2.2.3:
Routing field (VPI/VCI). VCI values from 0 to 31 can be used for signaling and OAM purposes.
VPI Field & VCI Field - Reserved VPI/VCI values
When processing cell headers, D500 takes the pre-assigned cell header values listed below into account:
• the pre-assigned cell header values for use by the physical layer at the UNI, [ITU-T-T.361] Table 1;
• the combinations of pre-assigned VPI, VCI, PTI and CLP values at the UNI [ITU-T-T.361] Table 2;
PTI Field
The PTI field encoding/decoding is compliant to [ITU-T-I.361].
B.4 Traffic Control & Congestion Control
The D500 implements VP/VC UPC at the UNI to detect violations of negotiated traffic parameters and reacts
appropriately to protect the QoS of other VPC's/VCC's.
If D500 is configured as a VP cross-connect, VP UPC can be performed on each VP connection.
Via configuration management following service classes can be configured:
D500 Rel 3.x
• CBR
• VBR-rt
D500 Rel 2.x
CBR
• VBR-rt
• VBR-nrt
• VBR-nrt with tagging
• UBR
• VBR-nrt
• VBR-nrt with tagging
• UBR
• UBR +
Traffic descriptors of VBR-nrt with tagging include PCR, SCR. Excess traffic is CLP tagged without cell dropping.
The class has the second lowest priority and can be used for same purpose as UBR+.
CLP Field
In downstream direction, the CLP bit setting is left untouched. In upstream, depending on the service class that is
configured, the CLP bit is checked and modified according to the UPC rules.